Retroactive reinsurance policies provide indemnification of losses and loss adjustment expenses of short-duration insurance contracts with respect to underlying loss events that occurred prior to the contract inception date. Claims payments may commence immediately after the contract date or, when applicable, after a contractual retention amount has been reached. Reconciliations of the changes in estimated liabilities for retroactive reinsurance unpaid losses and loss adjustment expenses (“claim liabilities”) and related deferred charges for each of the six-month periods ending June 30, 2022 and 2021 follow (in millions).

	2022						2021
	Unpaid losses and loss adjustment expenses			Deferred charges - retroactive reinsurance			Unpaid losses and loss adjustment expenses			Deferred charges - retroactive reinsurance
Balances at beginning of year	$	38,256		$	(10,639	)	$	40,966		$	(12,441	)
Incurred losses and loss adjustment expenses:
Current year contracts		—			—			82			—
Prior years’ contracts		(14	)		426			(3	)		473
Total		(14	)		426			79			473
Paid losses and loss adjustment expenses		(1,008	)		—			(808	)		—
Balances at June 30	$	37,234		$	(10,213	)	$	40,237		$	(11,968	)
Incurred losses and loss adjustment expenses, net of deferred charges	$	412					$	552

In the preceding table, classifications of incurred losses and loss adjustment expenses are based on the inception dates of the contracts, which reflect when our exposure to losses began. Incurred losses and loss adjustment expenses in the first six months for prior years’ contracts were $412 million in 2022 and $470 million in 2021 and included recurring amortization of deferred charges and the effect of changes in the timing and amount of expected future loss payments. Currently, our largest retroactive reinsurance contract is between our subsidiary, National Indemnity Company, and certain subsidiaries of American International Group, Inc. (collectively, “AIG”). Our estimated claim liabilities with regard to the AIG contract were approximately $15.2 billion at June 30, 2022 and $15.8 billion at December 31, 2021. Deferred charges related to the AIG contract were $4.24 billion at June 30, 2022 and $4.45 billion at December 31, 2021.